Internal-combustion-engine cylinder.



'J. O. TOW.

INTERNAL COMBUSTION ENGINE CYLINDER APPLICATION FILED APR.24. 9I1.

1 ,2'73, 1 09. Patented July 16, 1918 r L? I 1mm TOR.

row,

JAMES O.

or COLUMBIA,

MISSQ'U' EJ.

INTERNAL-COMBUSTION-ENGINE CYLINDER.

Specification of Letters Patent.

Patented July 16, 191$.

Application filed April 24, 1517. Serial No. 164,088.

To all whom it may concern:

Be it ltnown that I, Janus t). Tow, a citizen of the United States, residing at Golumbia, in the county of Boone and State of Missouri, have invented a new and useful Internal-Combustion-Engne Cylinder, of which the following is a specification.

My invention relates to improven'ients in internal combustion engine cylinders in which liquid or other fuel drawn into or forced into a cylinder provided with a piston and valve or valves, for combustion with air which is also drawn or forced into said cylinder; and the objects of my improvement are, to provide a practical. and efficient internal insulation for that part of the cylinder which is exposed to the tire, so as to prevent heat loss; and to simplify construction.

' I attain these objects by the construction illustrated in the accompanying drawing in which a vertical section of the cylinder is shown complete with piston.

The metal shell, 1, is made with two diameters and the larger end, which is also the head end, is lined for a distance shown, the lining extending to the piston head when the piston'is at the end of the first or third stroke in the case of a four cycle cylinder.

The insulation is coned oft toward the head.

The insulation, 3, is built up from rings of mica, asbestos, or other heat insulation material, alternating with relatively thin rings of metal for support and protection.

The piston, 2, is made with two diameters, the lower or larger part. lit-ting the lower metal faced bore of cylinder, the smaller part of piston operating within both the metal faced and insulated parts of bore but in contact with neither part of cylinder as shown.

The opening, 4, in the cylinder head is for the use of valve, valves or valve assembly, and for the spark plug when jump spark ignition used. The pitman is shown at and the piston head insulation at (3. A. ring, 7, may be used to retain the piston head insulation.

At 8, is shown a. small hole into which may be inserted a small am-Liliary air valve if desired, to help cool the upper part of piston. tievcral of these holes may be provided around the cylinder if desired.

The above special insulation construct ion which is my invention may be mnploycd in two cycle, four cycle, Diesel or semi-Diesel cycle motors.

ll am aware that insulations for internal combustion engii'ic cylinders have been invented and patented by others and that pistons having clearance with. such insulations have been used. 'ihcrefore i do not make broad claims covering the use of every kind o l. insulation with a cylinder and a piston with clean-nice, but limit my claims to the special insulation construction with a, cylinder shell, and piston substantially as described.

'ihercforc it claim:

1. in an internal combustion engine cylinder, the combination with a metal cylin-- der wall of an insulation lining built up of rings t i sulating material alternating with metal ri Tlhe c bustion shell of i ion, in an internal com- :yiindcr of a metal cylinder 0 diameters, a lining for the part of larger diam. composed of rings of insulating: material altcri'iating with rings of metal, together with a piston of two di aim-tors, the larger part of said piston litting, and operating within the metal part 01 cylinder bore, the smaller part clearing but operating; within the insulated part of cylinder and metal part as well. 

